Magnetic field measurement for analysis of GHz response in SPT head using electron beam tomography

Nakamura, Keisuke; Shimakura, Tomokazu; Suzuki, Hiroshi

doi:10.1016/j.jmmm.2004.10.054

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Electron holography study of magnetization behavior in the writer pole of a perpendicular magnetic recording head by a 1 MV transmission electron microscope

Hirata

Ishida

Akashi

et al. 2012

Journal of Electron Microscopy

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The magnetic domain structure of the writer poles of perpendicular magnetic recording heads was studied using electron holography. Although the domain structure of a 100-nm-thick writer pole could be observed with a 300 kV transmission electron microscope, that of the 250-nm-thick writer pole could not be analyzed due to the limited transmission capability of the instrument. On the other hand, the detailed domain structure of the 250-nm-thick writer pole was successfully analyzed by a 1 MV electron microscope using its high transmission capability. The thickness and material dependency of the domain structure of a writer pole were discussed.

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